Problem: Polycarp has just invented a new binary protocol for data transmission. He is encoding positive integer decimal number to binary string using following algorithm:

  * Each digit is represented with number of '1' characters equal to the value of that digit (for 0 it is zero ones). 
  * Digits are written one by one in order corresponding to number and separated by single '0' character. 



Though Polycarp learnt how to encode the numbers, he has no idea how to decode them back. Help him calculate the decoded number.

Input

The first line contains one integer number n (1 ≤ n ≤ 89) — length of the string s.

The second line contains string s — sequence of '0' and '1' characters, number in its encoded format. It is guaranteed that the number corresponding to the string is positive and doesn't exceed 109. The string always starts with '1'.

Output

Print the decoded number.

Examples

Input

3
111


Output

3


Input

9
110011101


Output

2031

Solution (in JAVA):

Solution:
//package summer_code;


import java.io.*;
import java.util.*;
import java.math.*;

/**
 *
 * @author Tushar 16 Jul, 2017
 */
public class A_825 {
    public static void main(String args[])
    {

        //File file= new File("COMPLETE_FILE_PATH");
        //InputStream is = new FileInputStream(file);
        
        
        //InputReader in = new InputReader(is);
        InputReader in = new InputReader(System.in);
        PrintWriter out= new PrintWriter(System.out);
        
        int t=1;
        Task solver=new Task();
        //long start = System.nanoTime();
        solver.solve(t,in,out);
        //long stop = System.nanoTime();
        //System.out.println("Execution time: " + ((stop - start) / 1e+6) + "ms.");
        

        out.flush();
        out.close();


    }

    static class Task {
        long mod = 1000000007;

        public void solve(int testNumber, InputReader in,PrintWriter out){
        
            int n=in.nextInt();
            String str=in.next();
            
            char[] ch=str.toCharArray();
            int num=0;
            int count=0;
            for(int i=0;i<ch.length;i++){
                count=0;
                while(i<ch.length && ch[i]!='0'){
                    count++;
                    i++;
                }
                
                num=num*10+count;
                
            }
            if(ch[ch.length-1]=='0')
                num=num*10;
            out.println(num);



        }
            
        int LOG2(long item){
            int count=0;
            while(item>1){
                item>>=1;count++;
            }
            return count;
        }

        long power(long x, long n) {
            if (n <= 0) {
                return 1;
            }
            long y = power(x, n / 2);

            if ((n & 1) == 1) {
                return (((y * y) % mod) * x) % mod;
            }

            return (y * y) % mod;
        }

        long gcd(long a, long b) {
            a = Math.abs(a);
            b = Math.abs(b);
            return BigInteger.valueOf(a).gcd(BigInteger.valueOf(b)).longValue();
        }
    }
    
    
    static class InputReader {
 
        private InputStream stream;
        private byte[] buf = new byte[8192];
        private int curChar, snumChars;
        private SpaceCharFilter filter;
 
        public InputReader(InputStream stream) {
            this.stream = stream;
        }
 
        public int snext() {
            if (snumChars == -1)
                throw new InputMismatchException();
            if (curChar >= snumChars) {
                curChar = 0;
                try {
                    snumChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (snumChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }
 
        public int nextInt() {
            int c = snext();
            while (isSpaceChar(c))
                c = snext();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = snext();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = snext();
            } while (!isSpaceChar(c));
            return res * sgn;
        }
 
        public long nextLong() {
            int c = snext();
            while (isSpaceChar(c))
                c = snext();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = snext();
            }
            long res = 0;
            do {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = snext();
            } while (!isSpaceChar(c));
            return res * sgn;
        }
 
        public int[] nextIntArray(int n) {
            int a[] = new int[n];
            for (int i = 0; i < n; i++)
                a[i] = nextInt();
            return a;
        }
 
        public String readString() {
            int c = snext();
            while (isSpaceChar(c))
                c = snext();
            StringBuilder res = new StringBuilder();
            do {
                res.appendCodePoint(c);
                c = snext();
            } while (!isSpaceChar(c));
            return res.toString();
        }

        public String next() {
            return readString();
        }
 
        public boolean isSpaceChar(int c) {
            if (filter != null)
                return filter.isSpaceChar(c);
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }
 
        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);
        }
    }


}